Okay, thank you!
Just reactivated the plugin, started getting the following warning message:
Undefined property: stdClass::$new_version in .../fulltext-search-pro/includes/updater/classes/wpfts_updater.php on line 130
when I go to 'installed plugins'. Is it something I should worry about?
@jgore No worry about this, this warning will be fixed in the nearest release of WPFTS Pro.